Machine-switching telephone-exchange system.



C. L. GOODRUM.

MACHINE SWITCHING TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED AUG-23,1915.

Patented Jan. 1, 1918.

Lie-251,504.

lll I S IlII \w M Mm V N/7 2 -55 es (PWI M2 relay 30 to ground. Magnet 26, at it 2-. The calling party now operates his sender S in transmitting the units digit of the wanted line. Upon the first dei nergiaation of the line relay 1), the slow relay 1G is again energized, and at its inner armature and front contact again energizes he the slow relay 16 after an interval. retract-s its arniatures. The retraction of the inner armature opens the circuit of. escapeinent magnet 17, but inasmuch as this magnet is slow-acting, it does not release the side switch instantly. If the selected line, upon whose test terminal the test brush 2). is now resting, is busy, such terminal 25 will be grounded, and, consequently, the following circuit is closed to the release magnet 26 of the connector before the escapement magnet deenergizes sufficiently to release the side switch: free pole of battery, magnet- 26, armature and back contact of relay 2?, primary oif-nornial spring 28, outer armature and back contact of relay 16, arm 1, test brush 2?. to grounded test terminal Magnet 26 at its right armature and front contact'locks itself over the following path: free pole of battery, magnet 26, right armance time and back contact of relay 2: 29, right armature and front 'coniac magnet 26, left armature and front contact ofrelay 15, armature and back contact of s armature and front contact, connects husyhaclr apparatus 31 to conductor 3;, in dlcating to the calling party at suhstatioi party restores his receiver, the line rel 10 is dcenergized which causes the relay to he denergized. Thisrelay, in retra its left armature, opens the locking circuit of magnet 26. The retraction of the left armature of magnet 26 disconnects the busyoack apparatus from connection ith conductor 32. The retraction of the ri armature of relay 15 grounds conductor leading'hack to the preceding switches to release the same.

if the selected line is idle, the test terminal 25 thereof is not grounded. Gasequently, at the end of units selection the denergization of relay 16, due to maintained energization of relay 10, causes the escapeinent magnet 37 to. become deenergized to release the side switch into position 3. in position 3, arm 1 grounds test terminal 25, thus causing this line to be unselectahic with the circuit to the secondary stepping magnet 19 as follows: free pole of battery, relay 3i, arm 3 and its second contact, ri ht armature and front contact of magnet i7, arma re and front contact of relay 10 to ground. This relay 3% is arranged to hold it armature attracted for an interval after its circuit is opened at side switch arm 3 and its second contact when the side switch moves out of position 2. Consequently, the following circuit is closed to give an initial short signal to the called party: free pole of ringing generator 35, armature and front contact of relay 3i, relay 30, left armature andfront contact of magnet 17, arm l, brush 21, terminal 24, line conductor a,bell 37, condenser 38, line conductor 6, terminal 2-3, brush 30, arm 5 to ground. Upon the retraction of the armature of relay 34:, the followiiig circuit is closed to ring the cell 37 in lierniittcntlyz free pole of ringinggenerator 35, interrupter 8G, armature and back contact of relay 3%, relay 30, through the bell 37 at substation B to around over the cir- 7 V cult just traced. When the party at snhsta tron B removes his receiver in answering the ush 21, terminal 24-h through the telephonic a paratus at substation 3. terminal 223. orus 20. arm 5 and its fourth contact right winding of relay 27 to ground. talking battery is now fed to the calling party over the windings of relay l0 and to the called party over the windings of relay 2?. Vihen he calling and called parties hang up their receivers, the following circuit is closed for the release magnet- 26 to release the connector and restore the side switch: pole of batter, magnet- 26, right arma ture andhack contact of relay 2?, primary 0E-I1OTH1ll contact 28, left armature and bacl: contact of relay l5, armature and back contact of relay 30 to ground. The retraction $0: switch. wherein seici lines terminate, 2i ringing current generator associated therewith, an interrupter normally in cii'cuii'; with said generator, and means for setting snici connector switch on said lines, of means operated due to connector switch being set on a, selected line for instantly appiyin; ringing curren from sairi generator to 521i line irrespective oi cheposition of said in: terrupter, and rein-y arranged in disconneat said genemion from Linc upen the response of the called party.

In a telephone exchange system the combination wiign telephone lines, 2 connec tcr switch wherein said lines terminate rinfl'ing current generator associated there- Witi an interrupter normally in circuit :Siiid gcnemfior, and j eens for setting said com'iector switch en said lines, of means cleei'ated due to the connector switch being; seten 3 sel cted line instantly connect mid generator direct to the seiecteci line independently of said interrupter, and n ZQiE'E" 111' "mgedto disconnect generate: frcm Salli line upon the response of the ceiied party. in. a telephone exchange system. combination with telephone lines a connector switch wherein said lines 'terminete a stepping il'i 'i ct fer setting said switch said lines 25 stepping relay arranged "5e transmit impulses to said stepping naegnee, i'i -ging gener t aassocieted ith seici ectct swimh and an interrupter ncrnmiiy ircuic with said i la n circuit with s; d for directly- 1 connecting said genemter to the selected line as seen as the connector switch is fihena-on to instantly connect ringing currenc thereto irrespective of the posiiien. of said 14 term-pier at in a. tcicphcnc exchange Sjgmifiifl the n connecccnibina'tion with telephone :3. tel switch wherein said lines terminate, a stepping magnet for setting said switch on snicl lines, a. stepping reiay arranged. no transmit impulses to siepping magnet, e l lgiilg generator asseciated with said new nectar switch, am} an interrupter normally in circuit with said fYQDQfflt-OI', e? slewacting rainy in parallel with said mu mg time said lines in directiy connecting said gene? iected line as soon as the cm i set thereon to inefianiiy cnnn current thercze irrespective e f c1 5111c: intemrupten 5. in e, i iepiione encne cxneinntien with *telepfeei tor where n ing sci-ting e lines, a stepping i i iiver impulses to said snapping magnet, eender adapted to intemmitenti said. stepping r iny, av slew relay 1% t: maintained energized (in, l H mien of said sender, a side Switch eent.;c.

said connector, a sinwncting mcnt iagneis l'Z ihemfon a circuit en escep .ment magnet c'onireZ-ieri at an ernmt and from C(ffltfififi eieaid slew rc'icy, a X'fiiEEez;

magnet for said cerenccwr, & circuit then-"f0? cent-railed at an aiiii'amr-e en l back c0- oi said eicw. relay; means fen 'ie'si; ccntactc {if busy 1 n a. mngi, ai'zez' esseciaeci with said ccnne 4 sI w--z 1eti22g i-eiey "ED131215; magnet and zine vcizezeby the 1m cf said release magma line is Mic twi mete pied "as said; line fer c Sikfifii inie in witnesefwhecccf, I hem an? my name this-"18th day of Angus;

'- ciileiiniie .n memmm. 

